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Backdoor:Win32/Cycbot.B Security Warning

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#1 1989kid


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Posted 27 December 2010 - 09:36 AM

Posting from Clean laptop:

Recieved a warning from Windows Defender on my desktop about this this morning, and clicked remove. Job done, I thought. Nope. It popped back up not 2 minutes later.

Computer is running Windows Vista 32 Bit.

So, I've downloaded and am running Dr.Web CureIt at the moment - fast scan revealed 4 infected files in the afflicted user area and the full scan hasn't turned up anything else as of posting. I've downloaded your recommended malware app as well, and will run that once Dr.Web has finished.

Anything else I can do in the mean time? Is it possible the infection is restricted to the one user area? If so, I have no qualms about deleting it as nothing of any importance is kept in it. I'm not averse to entering the registry or using command line either, so long as you tell me exactly what I need to do, what to look for etc.

My security on the system was Comodo Firewall and Avira Anti-Vir and I haven't had an infection under this combination since I started using them 3 or 4 years ago.

Again, anything else I can do in the mean time? This scan is going to take a long time.

Thanks for your help in advance.

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#2 boopme


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Posted 27 December 2010 - 09:22 PM

Hello is that Malwarebytes? post the scan log when done, Also what 4 were found by Drweb?

After those do an Online scan,post the log and how is it running now?
Please perform a scan with Eset Online Antiivirus Scanner.
This scan requires Internet Explorer to work. Vista/Windows 7 users need to run Internet Explorer as Administrator.
To do this, right-click on the IE icon in the Start Menu or Quick Launch Bar on the Taskbar and select Run As Administrator from the context menu.
  • Click the green Posted Image button.
  • Read the End User License Agreement and check the box:
  • Check Posted Image.
  • Click the Posted Image button.
  • Accept any security warnings from your browser.
  • Check Posted Image
  • Check Remove found threats and Scan potentially unwanted applications. (If given the option, choose "Quarantine" instead of delete.)
  • Click the Start button.
  • ESET will then download updates for itself, install itself, and begin scanning your computer.
  • If offered the option to get information or buy software at any point, just close the window.
  • The scan will take a while so be patient and do NOT use the computer while the scan is running. Keep all other programs and windows closed.
  • When the scan completes, push Posted Image
  • Push Posted Image, and save the file to your desktop as ESETScan.txt.
  • Push the Posted Image button, then Finish.
  • Copy and paste the contents of ESETScan.txt in your next reply.
Note: A log.txt file will also be created and automatically saved in the C:\Program Files\EsetOnlineScanner\ folder.
If you did not save the ESETScan log, click Posted Image > Run..., then type or copy and paste everything in the code box below into the Open dialogue box:

C:\Program Files\ESET\EsetOnlineScanner\log.txt
  • Click Ok and the scan results will open in Notepad.
  • Copy and paste the contents of log.txt in your next reply.
-- Some online scanners will detect existing anti-virus software and refuse to cooperate. You may have to disable the real-time protection components of your existing anti-virus and try running the scan again. If you do this, remember to turn them back on after you are finished.

NOTE: In some instances if no malware is found there will be no log produced.
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#3 1989kid

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Posted 29 December 2010 - 04:53 PM

Thank you, just responding to inform you this is a case closed. I followed the advice other another user's experience with this backdoor and the system is absolutely free of problems. DrWeb didn't find any additional files, Malwarebytes found 2 infected files and 2 infected registry entries. The ESET scan turned up nothing. Performed a full scan with Spybot S&D and then Avira AntiVir and they both turned up clean as well.

Just as a note to anyone that has the problem in future - I made use of RKill as soon as I logged in Normal Mode in order to run MalwareBytes.

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